/Engine/Source/Runtime/NavigationSystem/Public/NavigationSystem.h
Adds given element to NavOctree. No check for owner's validity are performed, nor its presence in NavOctree - function assumes callee responsibility in this regard
void AddElementToNavOctree ( const [FNavigationDirtyElement](API\Runtime\Engine\AI\Navigation\FNavigationDirtyElement) & DirtyElement )